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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `failure_detector` mod in crate `meta_srv`."><title>meta_srv::failure_detector - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-e56847b5.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="meta_srv" data-themes="" data-resource-suffix="" data-rustdoc-version="1.92.0-nightly (fa3155a64 2025-09-30)" data-channel="nightly" data-search-js="search-e256b49e.js" data-stringdex-js="stringdex-828709d0.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-ce535bd0.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Module failure_detector</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../meta_srv/index.html">meta_<wbr>srv</a><span class="version">1.0.0-rc.2</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module failure_<wbr>detector</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#constants" title="Constants">Constants</a></li><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate meta_<wbr>srv</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">meta_srv</a></div><h1>Module <span>failure_<wbr>detector</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/meta_srv/failure_detector.rs.html#15-564">Source</a> </span></div><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.HeartbeatHistory.html" title="struct meta_srv::failure_detector::HeartbeatHistory">Heartbeat<wbr>History</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>Holds the heartbeat statistics.
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It is capped by the number of samples specified in <code>max_sample_size</code>.</dd><dt><a class="struct" href="struct.PhiAccrualFailureDetector.html" title="struct meta_srv::failure_detector::PhiAccrualFailureDetector">PhiAccrual<wbr>Failure<wbr>Detector</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>This is our port of Akka’s “<a href="https://github.com/akka/akka/blob/v2.6.21/akka-remote/src/main/scala/akka/remote/PhiAccrualFailureDetector.scala">PhiAccrualFailureDetector</a>”
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under Apache License 2.0.</dd><dt><a class="struct" href="struct.PhiAccrualFailureDetectorOptions.html" title="struct meta_srv::failure_detector::PhiAccrualFailureDetectorOptions">PhiAccrual<wbr>Failure<wbr>Detector<wbr>Options</a></dt></dl><h2 id="constants" class="section-header">Constants<a href="#constants" class="anchor">§</a></h2><dl class="item-table"><dt><a class="constant" href="constant.FIRST_HEARTBEAT_ESTIMATE_MILLIS.html" title="constant meta_srv::failure_detector::FIRST_HEARTBEAT_ESTIMATE_MILLIS">FIRST_<wbr>HEARTBEAT_<wbr>ESTIMATE_<wbr>MILLIS</a><span title="Restricted Visibility"> 🔒</span> </dt></dl><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><dl class="item-table"><dt><a class="fn" href="fn.phi.html" title="fn meta_srv::failure_detector::phi">phi</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>Calculation of phi, derived from the Cumulative distribution function for
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N(mean, stdDeviation) normal distribution, given by
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1.0 / (1.0 + math.exp(-y * (1.5976 + 0.070566 * y * y)))
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where y = (x - mean) / standard_deviation
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This is an approximation defined in β Mathematics Handbook (Logistic approximation).
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Error is 0.00014 at +- 3.16
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The calculated value is equivalent to -log10(1 - CDF(y))</dd></dl></section></div></main></body></html> |